Amzer Silicone Skin Jelly Case for HTC ThunderBolt ADR6400 (Black) Fashionable & flexible Amzer Jelly Case for your new HTC ThunderBolt ADR6400! The Amzer Jelly Cases are made from durable premium silicone. Its special anti-dust and scratch-free properties, preserves your phones shining look. Helps to prevent your device from sliding on soft surfaces or angle surfaces. Precise cutouts give easy access to all the functionalities.